Home |
Search |
Today's Posts |
#13
|
|||
|
|||
push vs pull vis a vis rudders
On Wed, 31 Mar 2004 10:20:59 +0100, "JimB"
wrote: Steven Shelikoff wrote in message ... On Tue, 30 Mar 2004 08:04:41 -0700, Keith Hughes wrote: enormous snip Sorry to interrupt this thread, but you may remember a little earlier I said I'd go away and play with fans, bits of card, bits of wire and smoking fag ends to get my brain around this. The idea was suggested by a very reasonable post from Derek Rowell. Just to settle it for myself, once and for all, I just did my own experiment. I have a fan in the living room. It's about 12" in diameter. I got a light plastic spatula from the kitchen. I turned the fan on high and hung the spatula blade in front of the fan free to swing in all directions while I was controlling the angle of the blade to the fan. As expected, when I rotate the blade left, the spatula swings forward and to the left. Rotate right, it swings forward and to the right. So I hung the spatula just behind the fan. Lo and behold, the same thing happens but just a little less. When I rotate the spatula to the left, there is a noticable *left* motion to the blade... i.e., it's not only drawn forward into the blade but it also moved to the left from where it was when the spatula blade was perpendicular to the fan. When I turn it to the right, the spatula swings to the right. That proves to my satisfaction that if the rudder is close enough to the prop, it's direction will have some effect on the motion of the boat when you throw it in reverse even before the boat starts making sterway. Steve |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Angle of prop shaft - theoretical question. | General | |||
Which way do I turn the torque fin to compensate for the pull? | General | |||
Where to find ramp stories? | General | |||
Push starting your boat | Cruising | |||
Yamaha 100hp pull start | General |